body {
    margin: 0;
    padding: 0;
}

.top-navbar {
    background-image: linear-gradient(to bottom, #4d4f55, white);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    z-index: 1000; /* 保证导航栏在最上层 */
}

.sider{
    display: flex;
    flex-direction: column;
    text-align: center;
}

.cont{
    display: flex;
    flex-direction: row;
}

.logo img {
    width: 500px; /* 默认大小 */
    height: auto;
    transition: transform 0.3s; /* 添加缩放动画 */
}

.logo:hover img {
    transform: scale(1.3); /* 鼠标悬停时缩小 */
}
